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    DateThu, 9 Sep 2004 08:43:22 +0200
    FromWilly Tarreau <>
    SubjectRe: NFS hangs in 2.4.27
    On Wed, Sep 08, 2004 at 02:07:30PM +0200, Christoph Pleger wrote:
    > Hello,
    > 
    > Since a few days I have great NFS problems on six Linux machines. The
    > execution of "ps aux" shows that processes are hanging for they are
    > waiting for the completion of uninterruptable NFS I/O and the system
    > utilization becomes very high.
    > 
    > The hangs occurred since the installation of Kernel 2.4.27 (used 2.4.26
    > before), so I guess that Kernel 2.4.27 introduces the problems with NFS.
    > I am not sure about that, but since I reinstalled the old 2.4.26-Kernel
    > on one of the six computers, that machine works fine.
    > 
    > Has someone else experienced NFS hangs under 2.4.27 so far?
    
    I have seen this only with the preempt patch applied and enabled. But since
    the kernel also had lots of other patches applied, I cannot tell that it is
    only NFS+preemt alone. It deadlocked on a spinlock() in nfs_sync_page() IIRC.
    
    But no problem so far with preempt disabled.
    
    Regards,
    Willy
    
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